During the last years the analysis of the perinatal mortality with its casuistic and statistical aspect has gained importance as an instrument in organizing the health protection services for females. For further achievements in the ante-, intra- and postnatal care according to the social and scientific progress and to the needs of the people a sound knowledge of the morbidity structure is of great value. Relating to these points available data sources are analysed regarding their information contents and significance. Under the aspect of their prevalence the most important diseases during pregnancy are presented.